The nation's weather

A cold frontal boundary will dip southward over the Gulf Coast on Monday, while a separate cold front will approach the West Coast.

A cold front will extend from the southern Plains to the southern tip of Florida on Monday. As warm air from the Gulf of Mexico interacts with this frontal boundary, showers and thunderstorms will develop from southern Texas to Florida. Due to below normal temperatures across the central and eastern states, a mixture of rain and snow will be possible across the Tennessee Valley and parts of the Mid-Atlantic. Meanwhile, cold, blustery conditions will linger across the northern Plains, the upper Midwest, the Great Lakes and the Northeast as high pressure draws arctic air across the central and eastern thirds of the country. A wave of low pressure will trek across the central Plains and the Midwest, bringing a chance of snow showers to a handful of states across the region. Heavy snow will be possible across parts of the upper Midwest. The Northeast will stay mostly clear of precipitation on Monday.

Out west, a cold frontal boundary will approach the northwestern corner of the country. Late afternoon and evening rain will move across parts of Washington, Oregon and northern California, while a wintery mix of rain and snow will be possible in the higher elevations. The Southwest will stay warm and sunny on Monday, as temperatures will range between the 80s and 90s across the Desert Southwest.

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Temperatures in the Lower 48 states Sunday have ranged from a morning low of -25 degrees at Crane Lake, Minn. to a high of 89 degrees at Kendall, Fla.